TOC Macros: fix recursion regression

Fixes #3881

core/wiki/macros/toc.tid

@@ -12,7 +12,8 @@ tags: $:/tags/Macro
 \define toc-body(tag,sort:"",itemClassFilter,exclude,path)
 <ol class="tc-toc">
   <$list filter="""[all[shadows+tiddlers]tag<__tag__>!has[draft.of]$sort$] -[<__tag__>] -[enlist<__exclude__>]""">
-    <$vars item=<<currentTiddler>> path={{{ [<__path__>addsuffix[/]addsuffix<__tag__>] }}} excluded="""[enlist<__exclude__>] -[<__tag__>]""">
+    <$vars item=<<currentTiddler>> path={{{ [<__path__>addsuffix[/]addsuffix<__tag__>] }}}>
+      <$set name="excluded" filter="""[enlist<__exclude__>] [<__tag__>]""">
         <$set name="toc-item-class" filter=<<__itemClassFilter__>> emptyValue="toc-item" value="toc-item-selected">
           <li class=<<toc-item-class>>>
             <$list filter="[all[current]toc-link[no]]" emptyMessage="<$link><$view field='caption'><$view field='title'/></$view></$link>">
@@ -21,6 +22,7 @@ tags: $:/tags/Macro
             <$macrocall $name="toc-body" tag=<<item>> sort=<<__sort__>> itemClassFilter=<<__itemClassFilter__>> exclude=<<excluded>> path=<<path>>/>
           </li>
         </$set>
+      </$set>
     </$vars>
   </$list>
 </ol>